drivers/video/sunxi/lcdc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Timing controller driver for Allwinner SoCs.
   4  *
   5  * (C) Copyright 2013-2014 Luc Verhaegen <libv@skynet.be>
   6  * (C) Copyright 2014-2015 Hans de Goede <hdegoede@redhat.com>
   7  * (C) Copyright 2017 Jernej Skrabec <jernej.skrabec@siol.net>
   8  */
   9
  10 #include <common.h>
  11
  12 #include <asm/arch/clock.h>
  13 #include <asm/arch/lcdc.h>
  14 #include <asm/io.h>
  15
  16 static int lcdc_get_clk_delay(const struct display_timing *mode, int tcon)
  17 {
  18         int delay;
  19
  20         delay = mode->vfront_porch.typ + mode->vsync_len.typ +
  21                 mode->vback_porch.typ;
  22         if (mode->flags & DISPLAY_FLAGS_INTERLACED)
  23                 delay /= 2;
  24         if (tcon == 1)
  25                 delay -= 2;
  26
  27         return (delay > 30) ? 30 : delay;
  28 }
  29
  30 void lcdc_init(struct sunxi_lcdc_reg * const lcdc)
  31 {
  32         /* Init lcdc */
  33         writel(0, &lcdc->ctrl); /* Disable tcon */
  34         writel(0, &lcdc->int0); /* Disable all interrupts */
  35
  36         /* Disable tcon0 dot clock */
  37         clrbits_le32(&lcdc->tcon0_dclk, SUNXI_LCDC_TCON0_DCLK_ENABLE);
  38
  39         /* Set all io lines to tristate */
  40         writel(0xffffffff, &lcdc->tcon0_io_tristate);
  41         writel(0xffffffff, &lcdc->tcon1_io_tristate);
  42 }
  43
  44 void lcdc_enable(struct sunxi_lcdc_reg * const lcdc, int depth)
  45 {
  46         setbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
  47 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
  48         setbits_le32(&lcdc->tcon0_lvds_intf, SUNXI_LCDC_TCON0_LVDS_INTF_ENABLE);
  49         setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0);
  50 #ifdef CONFIG_SUNXI_GEN_SUN6I
  51         udelay(2); /* delay at least 1200 ns */
  52         setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_EN_MB);
  53         udelay(2); /* delay at least 1200 ns */
  54         setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVC);
  55         if (depth == 18)
  56                 setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVD(0x7));
  57         else
  58                 setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVD(0xf));
  59 #else
  60         setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_UPDATE);
  61         udelay(2); /* delay at least 1200 ns */
  62         setbits_le32(&lcdc->lvds_ana1, SUNXI_LCDC_LVDS_ANA1_INIT1);
  63         udelay(1); /* delay at least 120 ns */
  64         setbits_le32(&lcdc->lvds_ana1, SUNXI_LCDC_LVDS_ANA1_INIT2);
  65         setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_UPDATE);
  66 #endif
  67 #endif
  68 }
  69
  70 void lcdc_tcon0_mode_set(struct sunxi_lcdc_reg * const lcdc,
  71                          const struct display_timing *mode,
  72                          int clk_div, bool for_ext_vga_dac,
  73                          int depth, int dclk_phase)
  74 {
  75         int bp, clk_delay, total, val;
  76
  77 #ifndef CONFIG_SUNXI_DE2
  78         /* Use tcon0 */
  79         clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
  80                         SUNXI_LCDC_CTRL_IO_MAP_TCON0);
  81 #endif
  82
  83         clk_delay = lcdc_get_clk_delay(mode, 0);
  84         writel(SUNXI_LCDC_TCON0_CTRL_ENABLE |
  85                SUNXI_LCDC_TCON0_CTRL_CLK_DELAY(clk_delay), &lcdc->tcon0_ctrl);
  86
  87         writel(SUNXI_LCDC_TCON0_DCLK_ENABLE |
  88                SUNXI_LCDC_TCON0_DCLK_DIV(clk_div), &lcdc->tcon0_dclk);
  89
  90         writel(SUNXI_LCDC_X(mode->hactive.typ) |
  91                SUNXI_LCDC_Y(mode->vactive.typ), &lcdc->tcon0_timing_active);
  92
  93         bp = mode->hsync_len.typ + mode->hback_porch.typ;
  94         total = mode->hactive.typ + mode->hfront_porch.typ + bp;
  95         writel(SUNXI_LCDC_TCON0_TIMING_H_TOTAL(total) |
  96                SUNXI_LCDC_TCON0_TIMING_H_BP(bp), &lcdc->tcon0_timing_h);
  97
  98         bp = mode->vsync_len.typ + mode->vback_porch.typ;
  99         total = mode->vactive.typ + mode->vfront_porch.typ + bp;
 100         writel(SUNXI_LCDC_TCON0_TIMING_V_TOTAL(total) |
 101                SUNXI_LCDC_TCON0_TIMING_V_BP(bp), &lcdc->tcon0_timing_v);
 102
 103 #if defined(CONFIG_VIDEO_LCD_IF_PARALLEL) || defined(CONFIG_VIDEO_DE2)
 104         writel(SUNXI_LCDC_X(mode->hsync_len.typ) |
 105                SUNXI_LCDC_Y(mode->vsync_len.typ), &lcdc->tcon0_timing_sync);
 106
 107         writel(0, &lcdc->tcon0_hv_intf);
 108         writel(0, &lcdc->tcon0_cpu_intf);
 109 #endif
 110 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
 111         val = (depth == 18) ? 1 : 0;
 112         writel(SUNXI_LCDC_TCON0_LVDS_INTF_BITWIDTH(val) |
 113                SUNXI_LCDC_TCON0_LVDS_CLK_SEL_TCON0, &lcdc->tcon0_lvds_intf);
 114 #endif
 115
 116         if (depth == 18 || depth == 16) {
 117                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[0]);
 118                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[1]);
 119                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[2]);
 120                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[3]);
 121                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[4]);
 122                 writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[5]);
 123                 writel(SUNXI_LCDC_TCON0_FRM_TAB0, &lcdc->tcon0_frm_table[0]);
 124                 writel(SUNXI_LCDC_TCON0_FRM_TAB1, &lcdc->tcon0_frm_table[1]);
 125                 writel(SUNXI_LCDC_TCON0_FRM_TAB2, &lcdc->tcon0_frm_table[2]);
 126                 writel(SUNXI_LCDC_TCON0_FRM_TAB3, &lcdc->tcon0_frm_table[3]);
 127                 writel(((depth == 18) ?
 128                         SUNXI_LCDC_TCON0_FRM_CTRL_RGB666 :
 129                         SUNXI_LCDC_TCON0_FRM_CTRL_RGB565),
 130                        &lcdc->tcon0_frm_ctrl);
 131         }
 132
 133         val = SUNXI_LCDC_TCON0_IO_POL_DCLK_PHASE(dclk_phase);
 134         if (mode->flags & DISPLAY_FLAGS_HSYNC_LOW)
 135                 val |= SUNXI_LCDC_TCON_HSYNC_MASK;
 136         if (mode->flags & DISPLAY_FLAGS_VSYNC_LOW)
 137                 val |= SUNXI_LCDC_TCON_VSYNC_MASK;
 138
 139 #ifdef CONFIG_VIDEO_VGA_VIA_LCD_FORCE_SYNC_ACTIVE_HIGH
 140         if (for_ext_vga_dac)
 141                 val = 0;
 142 #endif
 143         writel(val, &lcdc->tcon0_io_polarity);
 144
 145         writel(0, &lcdc->tcon0_io_tristate);
 146 }
 147
 148 void lcdc_tcon1_mode_set(struct sunxi_lcdc_reg * const lcdc,
 149                          const struct display_timing *mode,
 150                          bool ext_hvsync, bool is_composite)
 151 {
 152         int bp, clk_delay, total, val, yres;
 153
 154 #ifndef CONFIG_SUNXI_DE2
 155         /* Use tcon1 */
 156         clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
 157                         SUNXI_LCDC_CTRL_IO_MAP_TCON1);
 158 #endif
 159
 160         clk_delay = lcdc_get_clk_delay(mode, 1);
 161         writel(SUNXI_LCDC_TCON1_CTRL_ENABLE |
 162                ((mode->flags & DISPLAY_FLAGS_INTERLACED) ?
 163                         SUNXI_LCDC_TCON1_CTRL_INTERLACE_ENABLE : 0) |
 164                SUNXI_LCDC_TCON1_CTRL_CLK_DELAY(clk_delay), &lcdc->tcon1_ctrl);
 165
 166         yres = mode->vactive.typ;
 167         if (mode->flags & DISPLAY_FLAGS_INTERLACED)
 168                 yres /= 2;
 169         writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
 170                &lcdc->tcon1_timing_source);
 171         writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
 172                &lcdc->tcon1_timing_scale);
 173         writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
 174                &lcdc->tcon1_timing_out);
 175
 176         bp = mode->hsync_len.typ + mode->hback_porch.typ;
 177         total = mode->hactive.typ + mode->hfront_porch.typ + bp;
 178         writel(SUNXI_LCDC_TCON1_TIMING_H_TOTAL(total) |
 179                SUNXI_LCDC_TCON1_TIMING_H_BP(bp), &lcdc->tcon1_timing_h);
 180
 181         bp = mode->vsync_len.typ + mode->vback_porch.typ;
 182         total = mode->vactive.typ + mode->vfront_porch.typ + bp;
 183         if (!(mode->flags & DISPLAY_FLAGS_INTERLACED))
 184                 total *= 2;
 185         writel(SUNXI_LCDC_TCON1_TIMING_V_TOTAL(total) |
 186                SUNXI_LCDC_TCON1_TIMING_V_BP(bp), &lcdc->tcon1_timing_v);
 187
 188         writel(SUNXI_LCDC_X(mode->hsync_len.typ) |
 189                SUNXI_LCDC_Y(mode->vsync_len.typ), &lcdc->tcon1_timing_sync);
 190
 191         if (ext_hvsync) {
 192                 val = 0;
 193                 if (mode->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 194                         val |= SUNXI_LCDC_TCON_HSYNC_MASK;
 195                 if (mode->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 196                         val |= SUNXI_LCDC_TCON_VSYNC_MASK;
 197                 writel(val, &lcdc->tcon1_io_polarity);
 198
 199                 clrbits_le32(&lcdc->tcon1_io_tristate,
 200                              SUNXI_LCDC_TCON_VSYNC_MASK |
 201                              SUNXI_LCDC_TCON_HSYNC_MASK);
 202         }
 203
 204 #ifdef CONFIG_MACH_SUN5I
 205         if (is_composite)
 206                 clrsetbits_le32(&lcdc->mux_ctrl, SUNXI_LCDC_MUX_CTRL_SRC0_MASK,
 207                                 SUNXI_LCDC_MUX_CTRL_SRC0(1));
 208 #endif
 209 }
 210
 211 void lcdc_pll_set(struct sunxi_ccm_reg *ccm, int tcon, int dotclock,
 212                   int *clk_div, int *clk_double, bool is_composite)
 213 {
 214         int value, n, m, min_m, max_m, diff;
 215         int best_n = 0, best_m = 0, best_diff = 0x0FFFFFFF;
 216         int best_double = 0;
 217         bool use_mipi_pll = false;
 218
 219         if (tcon == 0) {
 220 #if defined(CONFIG_VIDEO_LCD_IF_PARALLEL) || defined(CONFIG_SUNXI_DE2)
 221                 min_m = 6;
 222                 max_m = 127;
 223 #endif
 224 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
 225                 min_m = 7;
 226                 max_m = 7;
 227 #endif
 228         } else {
 229                 min_m = 1;
 230                 max_m = 15;
 231         }
 232
 233         /*
 234          * Find the lowest divider resulting in a matching clock, if there
 235          * is no match, pick the closest lower clock, as monitors tend to
 236          * not sync to higher frequencies.
 237          */
 238         for (m = min_m; m <= max_m; m++) {
 239 #ifndef CONFIG_SUNXI_DE2
 240                 n = (m * dotclock) / 3000;
 241
 242                 if ((n >= 9) && (n <= 127)) {
 243                         value = (3000 * n) / m;
 244                         diff = dotclock - value;
 245                         if (diff < best_diff) {
 246                                 best_diff = diff;
 247                                 best_m = m;
 248                                 best_n = n;
 249                                 best_double = 0;
 250                         }
 251                 }
 252
 253                 /* These are just duplicates */
 254                 if (!(m & 1))
 255                         continue;
 256 #endif
 257
 258                 /* No double clock on DE2 */
 259                 n = (m * dotclock) / 6000;
 260                 if ((n >= 9) && (n <= 127)) {
 261                         value = (6000 * n) / m;
 262                         diff = dotclock - value;
 263                         if (diff < best_diff) {
 264                                 best_diff = diff;
 265                                 best_m = m;
 266                                 best_n = n;
 267                                 best_double = 1;
 268                         }
 269                 }
 270         }
 271
 272 #ifdef CONFIG_MACH_SUN6I
 273         /*
 274          * Use the MIPI pll if we've been unable to find any matching setting
 275          * for PLL3, this happens with high dotclocks because of min_m = 6.
 276          */
 277         if (tcon == 0 && best_n == 0) {
 278                 use_mipi_pll = true;
 279                 best_m = 6;  /* Minimum m for tcon0 */
 280         }
 281
 282         if (use_mipi_pll) {
 283                 clock_set_pll3(297000000); /* Fix the video pll at 297 MHz */
 284                 clock_set_mipi_pll(best_m * dotclock * 1000);
 285                 debug("dotclock: %dkHz = %dkHz via mipi pll\n",
 286                       dotclock, clock_get_mipi_pll() / best_m / 1000);
 287         } else
 288 #endif
 289         {
 290                 clock_set_pll3(best_n * 3000000);
 291                 debug("dotclock: %dkHz = %dkHz: (%d * 3MHz * %d) / %d\n",
 292                       dotclock,
 293                       (best_double + 1) * clock_get_pll3() / best_m / 1000,
 294                       best_double + 1, best_n, best_m);
 295         }
 296
 297         if (tcon == 0) {
 298                 u32 pll;
 299
 300                 if (use_mipi_pll)
 301                         pll = CCM_LCD_CH0_CTRL_MIPI_PLL;
 302                 else if (best_double)
 303                         pll = CCM_LCD_CH0_CTRL_PLL3_2X;
 304                 else
 305                         pll = CCM_LCD_CH0_CTRL_PLL3;
 306 #ifndef CONFIG_SUNXI_DE2
 307                 writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST | pll,
 308                        &ccm->lcd0_ch0_clk_cfg);
 309 #else
 310                 writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST | pll,
 311                        &ccm->lcd0_clk_cfg);
 312 #endif
 313         }
 314 #ifndef CONFIG_SUNXI_DE2
 315         else {
 316                 writel(CCM_LCD_CH1_CTRL_GATE |
 317                        (best_double ? CCM_LCD_CH1_CTRL_PLL3_2X :
 318                                       CCM_LCD_CH1_CTRL_PLL3) |
 319                        CCM_LCD_CH1_CTRL_M(best_m), &ccm->lcd0_ch1_clk_cfg);
 320                 if (is_composite)
 321                         setbits_le32(&ccm->lcd0_ch1_clk_cfg,
 322                                      CCM_LCD_CH1_CTRL_HALF_SCLK1);
 323         }
 324 #endif
 325
 326         *clk_div = best_m;
 327         *clk_double = best_double;
 328 }